change (accept invite) : map Unknown error to AcceptInvite.Failures.InvalidInvite

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/join/JoinRoom.kt

@@ -16,4 +16,8 @@ interface JoinRoom {
         serverNames: List<String>,
         trigger: JoinedRoom.Trigger,
     ): Result<Unit>
+
+    sealed class Failures : Exception() {
+        data object UnauthorizedJoin : Failures()
+    }
 }